Error in Units: Smooth Function

[DanielH]

Dear All,

I am using the smooth function to portray a process where a firm projects the expected market share via an exponential smoothing of the actual market share variable.

Although the model is behaving/simulating normally, I keep getting a "error in units" message when doing the units check.

Input and output (market share) are set as dimensionless, but, Vensim indicates that one of the sides is in 'months'.

Has anyone faced this error before? I am afraid there may be a conceptual issue in the model.

Thanks! regards, Daniel


Analysis of units error:
Right hand and left hand units do not match
#Projected Market Share of Firm 2>SMOOTHI#
Has Units: Dimensionless
INTEG( ( Market Share Firm 2
- #Projected Market Share of Firm 2>SMOOTHI# )
/ ( 3) ,
( 0.5) )
Has Units: Month

[Administrator]

Can you post the actual equation as well?

[DanielH]

Thank you; please find the equation below.

Projected Market Share of Firm 2=SMOOTHI(Market Share Firm 2,3,0.5)
Units: Dmnl

[DanielH]

Just meant to circle back and say that when inserting the variable as a Level the error in units problem no longer appears. I inserted as a level and then changed the type to auxiliary, (just like the documentation tells to do .

Thanks.

[bob@vensim.com]

The source of the problems is the use of numbers, instead of named constant variables, in the SMOOTHI function. The explicit equations can more readily accommodate this, so you don't get the error message. You might consider naming the adjustment time and initial value as explicit constants. This both makes the equation clearer, and allows you to easily change the constants when experimenting with the model.

[DanielH]

Thanks; I have included the two constant parameters to make the model clearer as per suggested.